"Bring my brother... back to life?"
Tobirama repeated the words under his breath, his gaze full of doubt as he looked at Kou.
"That's right."
Kou nodded. He lowered the hand covering his Rinnegan, pointed to his right eye, and said calmly:
"I'll use the Rinnegan to perform a technique called the Rinne Rebirth Technique. It consumes a vast amount of chakra and brings the dead back to life at the cost of the user's life.
"But that won't be a problem for me."
"My ocular technique, the Inari God, can absorb chakra to replenish my own.
"As long as I absorb a little chakra from each of you before performing the Rinne Rebirth Technique, it'll be enough to cover the cost."
Kou paused and raised his right hand, palm up.
The spot in the center of his palm where the sun mark of the Six Paths Yang Power had once appeared was now empty.
Looking at the bare skin, Kou gave a knowing smile.
"As for the cost in life force—just before the Six Paths Yang Power faded, I used the Inari God to draw some of it into my Rinnegan. It's still there; I haven't fully absorbed it.
"With the Six Paths Yang Power to support me, on top of my Sage Body, using the Rinne Rebirth Technique to revive one person won't come close to endangering my life."
Tobirama quickly took in everything Kou had said. His furrowed brow gradually relaxed, and he gave a slight nod.
"I think I understand how you intend to revive my brother.
"But..."
He paused, his crimson eyes fixed on Kou as his tone grew grave.
"What did you mean by training?
"If I'm not mistaken, it won't be any ordinary training.
"After all, a short spell of training alone won't